Wrench



F. P. ROBERT. WRENCH.

APPLICATION man APR.2. 1921.

1,407,578, Patented Feb. 21, 1922.

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Specification of Letters Patent.

latented Feb. 22L, 1922.

Application filed. April 2, 1921. Serial No. 458,164.

To all whom it may concern,

Be it known that I, FREDERIO P. Rosin: a citizen of Switzerland, and aresident of Lynnbrook, Long Island, in the county of Queens and State ofNew York, have invented a new and useful lVrench, of which the followingis a specification. 7

My invention relates to wrenches and its principal object resides in theprovision of a wrench which is self adjustable.

It is a further object of the invention to provide a self adjustablewrench which will positively grip a nut or other object.

A further general object of the invention is to provide a wrench ofcomparative sim-.

plicity and which at the same time is simple spirit of the invention orthe scope of the in operation and inexpensive to manufacture.

lVith the preceding and other objects that will be apparent from thefollowing specification, the invention consists in the novel combinationof elements, constructions and operations to be specifically pointedout, claimed and illustrated in the accompanying drawing wherein,

Figure 1 is a side elevation of my improved wrench in inoperativeposition,

Fig. 2 is a similar view showing the wrench engaged with a nut, and,

Fig. 3 is a top plan viewof the wrench.

Referring in detail to the drawing wherein similar characters ofreference denote corresponding parts throughout the several views, thenumeral 5 designates a stationary or rigidjaw provided with serrations 6upon its inner face at the forward end thereof. The jaw 5 is formedwith, at its opposite end, a shank or handle 7.

The numeral 8 designates a swinging mov-' able aw provided withserrations 9 upon its inner face. As illustrated in Fig. 1 this jaw 8 isnormally disposed at an oblique angle with respect to the longitudinalaxis of the jaw 5 with its forward end projecting beyond the forward endof the jaw 5. Pairs of links 10 are pivoted to the outer face of thejaws 5 and 8 and as shown in Fig. 2 each pair slightly diverge from theother pair.

In order to normally swing. the links 10 forwardly to cause the jaw 8 tobe held into engagement with a nut or other object, a contractile spring11 is provided which has its ends connected to transverse pins 12carried by the links 10.

From the disclosure it will be seen that the jaw 8 will be yieldablyheld against the nut or other object and that the wrench will readilyadjust itself to objects of various slzes.

It is to be understood that the form of my invention herein shown anddescribed is to be taken as a preferred example of the same, and thatvarious changes in the shape, size and arrangement of parts may beresorted to without departing from the subjoined claims.

Having thus described my invention, what I claim as new and desire tosecure and protect by Letters Patent of the United States is:

1. A. wrench comprising a rigid jaw, a movable jaw arranged in opposedrelation thereto, pairs of links having their ends pivotally connectedwith the opposite faces of the jaws, and a contractile spring arrangedbetween the jaws and having its ends connected with the links at pointsbetween each pair of the same, the spring being disposed in closeproximity to the movable jaw so that the force of the same acting on themovable jaw will be in a plane parallel to the direction of travel ofthe movable jaw.

2. A. wrench comprising a rigid jaw, a handle extending from one endthereof, a movable jaw opposed to the rigid jaw and movable in a planewhich is oblique to the longitudinal axis of the rigid jaw, pairs oflinks arranged in divergent relation and having their ends pivoted tothe outer faces of the jaws, pins extending transversely of each pair oflinks, and a coil spring disposed parallel to the swinging jaw when thelatter is in normal position and having its ends connected to the pins,the spring normally holding the movable jaw in advance of the rigid jawto yieldably hold the movable aw into engagement with the object to begripped.

FREDERIO P. ROBERT.

